Apple notified participants of its AppleSeed program today that OS X Mountain Lion beta build 12C35 is now available for download. The 671MB update contains no known issues, Apple stated. Furthermore, Apple would like developers to focus on messages, Facebook, Game Center, Safari and Reminders when testing the pre-release software.

The release notes say “TDB,” which indicates this is not a final release. It is also worth noting this is not a release to members of Apple’s Developer Program, as that will presumably come later on.

Apple seeded the first beta of 10.8.2 to developers last week, which contained the same focus areas. AppleSeed participants: Let us know what you find!